A pig landed on a US Airways flight out of Connecticut on Wednesday, but was taken off the plane after it became disruptive, a spokesperson told ABC News.

Jonathan Skolnik, a professor at the University of Massachusetts Amherst and a passenger on the flight, told ABC News today he thought the woman with the pig was carrying a duffel bag when she got on the plane and headed straight for the empty seat next to him.

"But it turns out it wasn't a duffel bag. We could smell it and it was a pig on a leash," he said. "She tethered it to the arm rest next to me and started to deal with her stuff, but the pig was walking back and forth."

"I was terrified, because I was thinking I'm gonna be on the plane with the pig," Snolnik added, saying he guesses the pig weighed between 50 and 70 pounds.

But the flight didn't take off with the pig. The woman and the animal eventually deplaned.

American Airlines, the parent company of US Airways, confirmed to ABC News that a passenger brought the pig aboard as an emotional support animal. After the pig became disruptive, she was asked to leave, a spokesperson said.